268 PROCEEDINGS OF THE AMERICAN ACADEMY. 



0.1449 grm. of the oil gave 0.4589 grm. CO2 and 0.1807 grm. HgO. 



Calculated for 0„H2;j. Found. 



C 85.70 86.37 



H 14.30 13.57 



From the results of this analysis it is evident that uonane forms no 

 appreciable proportion of Puente oil. 



Dekanaphtene, CjoHsQ. 



50 grms. of a distillate collected at 1G0°-1 62°, with smaller quantities 

 on either side. A determination of its specific gravity at 20° gave 

 0.7966, and after agitation with sulphuric acid, 0.7745. The composi- 

 tion of this distillate after treatment with the acid was shown by 

 analysis : — 



0.1747 grm. of the oil gave 0.5515 grm. CO^ and 0.2185 grm. HgO. 



Calculated for CjoHjo. Found. 



C 85.70 86.09 



H 14.30 13.90 



Fraction 168°-172°. 



In all the California oils examined, as stated above, considerable 

 quantities have collected at 168°-172°. Since large proportions of 

 the benzol hydrocarbons appear in all these oils, the distillate 168°- 

 172° might consist to a large extent of pseudocumol, boiling point 168°. 

 The high specific gravity of the fraction before treatment with the acid, 

 0.8063, and the lower value after treatment, 0.7874, indicates a con- 

 siderable proportion of the benzol homologue. Even after the acid 

 treatment, the percentages of carbon and hydrogen showed the presence 

 still of the same constituent: carbon, 85.91; hydrogen, 13.61. It 

 seems probable, therefore, that the benzol homologue constitutes the 

 greater part of this distillate, and the residue after treatment is doubtless 

 higher or lower constituents. But the absence of a decane corresponding 

 to the decane in Pennsylvania petroleum, boiling at 172°, is assured. 



Fraction 180°-182°. 



.Only 10 grms. collected at 180°-182°, with smaller quantities on either 

 side. Although this quantity of the oil was insufficient for complete 

 examination, its specific gravity before and after analysis was ascertained, 

 and an analysis made after treatment with acid. Before treatment the 



